Expansion joint



April 27, wz@ 1,582,638

R. B. CRABBS EXPANSION JOINT Filed 00?.. 5, 1921 Patented Apr. R27, 19,26.

UNITED STATES PATENT OFFICE.

nosCoE B. CRABBs, or CINCINNATI, OHIO, AssIeaToPv To THE PIIILIP CAREY MANU- l PACTURINC COMPANY, A CORPORATION or CHIC.

EXPANSION JOINT.

Application led )October 3, 1921. Serial NLO. 504,958.

contraction due to climatic changes in temperature. -It is especially adapted for use in pavements or roadways and more especially concrete roadways. It may be used wherever there is need for such a'joint in concrete work. I have found that in the' form shown in Fig. 2 when the expansion joint is,

placed in position and the concrete poured, it, the concrete, iows into the holes CC forming in the concrete little lugs which locks the v joint in place.

I have found that by use of a .layer of felt or paper on either or both of the surfaces of an expansion joint that, while it facilitates shipment and handling generally, it sometimes prevents satisfactory locking or l anchoring of Ithe joint in position. '-To over-- come this I arrange a'seres of holes of any desired form in the felt. orpaper and have the bituminous compound pass into or extend through these holes-so that when the joint is installed the bituminous compound by its adhesive qualities firmly locks the jointto adjacent blocks of concrete or lother material. v j

I have found that bythe useof a layer of asbestos paper. in combination with a body of bituminous compound amore last'-v ing and satisfactory joint is formed. j A

y In the drawingFig. 1 is a perspective view of my joint, Fig. 2 is across section of-a modification. In the drawing I have shown my expansion joint havinga piece of asbestos paper or felt A on each side of'a body.

yof bituminous compound B. The asbestos paper. or felt may be either saturated with a bituminous saturant or may be unsaturated as desired. vIf desired any felt other than 'asbestos or any other paper could be used.

I perfer however to usea felt which is in its nature elastic as are wool and asbestos felts. I also prefer to have the lioles C in the paper or felt A in staggered arrangement so thatl when the joints are packed uporr each other there is less liability .fo-r the same to adhere as the lugs of bituminous material'in the holes are less lia-ble to be brought into align@ ment. Y

In the manufacture of my joint I `preferably'v compress same so that the bituminous compound fills the holes and gives a substantially level surface, as in Fig. l, but if a felt, or paper of substantial thickness, is used I ymay only partially fill. the holes .as shown' Ain Fig. f2 so as to further prevent adherence' of the joints when -packed upon each other.

Inthe later case the compression of the felt when the joint is in place will.` cause the ybituminous-material to Xtend to or beyondthe exterior surface of the paper or felt and the j consequent adhesion with adjacent pavement take place.

Claims:

l. In an expansion joint a mass of bituminous material, elastic flexible bituminous saturated surface layer thereon and openings in said layer. to permit Contact of the' bituminous material with adjacent -mater1al.

In an expansion jointl afmass of bituminous material, a iexible asbestos surface layer thereon and openings in said layer to permit Contact vof the bituminous material with adjacent material.

In testimony whereof, I have signed my name to" this specification.

Roscon B. CRABBS. 

